Sash-holding device



March 27, 1945.l R. H. BREITENBACH ETAL SASH HOLDING DEVI CE Filed May` 13, A1941 4 Sheets-Sheet l Mardi 27, 1945 R. H. BREITENBACH l-:I'rAL 2,372,634

SASH HOLDING DEVICE Filed May 1s, 1941 `4 Sheets-Sheet 2 lillll li w ma m w a m 3,0 G

March 27, 1945- R. H. BREITENBACH ET AL 2,372,534

SASH HOLDING DEVICE 4 Sheets-Sheet 3 Filed May l5 nventor 4March 27, 1945- R. H. BREITENBACH ETAL SASH HOLDING DEVICE Filed May 13, 1941 4 Sheets-SheetA Bg 2360/ ZZ//Y/e//y l /ll/ Patented Mar. 27, 1945 i SASH-HOLDING DEVICE Robert H. Breitenbach and Leon E. Willett, De-

troit, Mich., assignors to Chamberlin Metal Weather Strip Company, Detroit, Mich., a corporation of Michigan Application May 13, 1941, Serial No. 393,208

13 Claims.

This invention relates to sash-holding structures, and particularly to weightless sash-hold` ing devices.

One object of this invention is to Provide a sash-holding device which applies a more powerful force against downward motion of the sash than upward motion, so that the weight of the window sash will be firmly sustained when the window is open, yet will require only a slight liftingforce to raise the window.

Another object is to provide a sash-holding device wherein a less powerful force is required to open the Window than to close it.

Another object is to provide a sash-holding device wherein a frictional member is yieldingly urged against the weatherstrip or a portion of the window frame in such `a manner that the downward force appliedv to close the window is less than the upward force required to raise it or hold it in a fixed position against the downf ward force of itsA Weight.

Another object is to provide a sash-holding device as set forth in the foregoing objects wherein mechanism is `provided for `finely adjusting the position of lthe friction member" relatively to the window portion or weatherstrip engaged thereby. l

Another object is to provide a sash-holding device as set forth in the foregoing objects wherein mechanism is provided for increasing or decreasing the `pressure exerted against the friction member which engages the window frame portion or weatherstrp. l

Another object is to provide a sash-holding device as set 'forth in the foregoing objects wherein an adjustment is accessible from the top or bottom of the'window sash for varying the force by which the window i-s frictionally held open.

Another object is to provideimproved means for securing a sash-holding device to a window sash as set forth in the preceding objects.

In the drawings: f l Figure l is a side elevation, partly in section, of a preferred embodiment of a sash-holding device according to the present invention.

Figure 2 is a .top plan view of the sash-holding device of Figure 1 taken in section along the line 2--2 therein. rFigure 3 is a Vertical section taken along the line 3-3 in Figure 1. f

Figure 4 is a cross section taken along the line 4 4 in Figure 1.`

Figure 5 is a perspective viewv of the working unit portion of the'sash-holding device of Figure 1. y

Figure 6 is a perspective view of the container for the working unit shown in Fig-ure 5.

Figure '7 is a side elevation, partly broken away, of a window sash and frame assembly with the sash-holding device of Figure 1 installed.

Figure 8 is a top plan view of a modification of the sash-holding device of Figures 1 and 2, showing the device installed to exert pressure at right angles to the plane of the window pane.

Figure 9 is a top plan view of another modification similar to Figures 2 and 8 but adapted to exert pressure against the side of the window Iframe in the plane of the window pane.

Figure 10 is a side elevation similar to Figure 3 but showing a 4further modification thereof wherein a bent metal frame is provided for the adjusting pins instead of the solid bar. of Figure 3.

Figure llis a view similar to Figure l but showing-a further modification wherein an adjustment is provided for directly varying the` spring pressure exerted upon the sash holding` friction member.

Figure l2 is a topy plan viewof Figure 11 taken partly in section along the line |2l2 therein.

Figure 13 is a vertical section taken along the line I3-I3 in Figure 11.

, Figure 14 is an' intermediate cross section taken along the line lli- M in Figure 11.

Figure l5 is a lower cross section taken along the line l5-I 5 in Figure 11 and showing the construction of the adjusting nut.

Figure 16 is a perspective view of a modified form of working unit portion of the sash-holding device of Figure 1, as shown in Figures 11 to 15.

Figure 17 is a perspective view of a modif-led container for the modified working unit shown in Figure 16.

Figure 18 is a side elevation, partly in section, I

of a modified sash holding device from that shown in Figure 3.

Figure 19 is a section along the line yIS---lil in Figure 18, additionally broken away.

Figure 20 is a cross section along the line A2il-2il in Figure 18.

Figure 21 is a perspective View of the modified friction-applying member used in the modification of Figure 18.

Figure 22 isa `perspective view of the adjusting member used with the friction-applying member of Figure 2l.

Figure 23 isa perspective View of the modified container used with the modified friction-applying member and adjusting member of Figures 2l and 22 respectively.

General arrangement In general, the sash-holding device of this invention consists of a friction-applying unit installed in a recess in one of the vertical members of the window sash. This friction-applying unit consists of a friction member which is'urged by aspring into engagement with the weather- `strip or a portion of the Window frame. The

friction member is mounted on a channel member having diagonal slots in its opposite sides. These diagonal slots are engaged by pins in a longitudinally adjustable carrier having a screw for moving this carrier to and fro. The motion of this carrier causes the pins to engage the diagonal slots at different points therein and hence causes the channel member and the friction member carried by it to occupy different positions laterally` A coil spring urges the channel member longitudinally, this longitudinal movement being converted into a lateral movement of the friction member by the engagement of the pins with the diagonal slots.

In a modification of the invention (Figure 8), the friction member engages 'a portion of the window frame in a direction perpendicular to the direction of the window pane instead of the weatherstrip, as in the principal form (Figure 2). In a second modification (Figure 9), the friction-applying unit is mounted at right angles to its position in the previous modification (Figure 8) so that the friction member engages the 4side of the window frame in a direction parallel to the plane of the window pane.

In a third modification (Figure 10), the pins which engage the diagonal slots in the channel member are mounted in a carrier composed of a bent metal strip instead of in a solid bar as in the principal form (Figures 3 and 5). In a fourth modification (Figure 1l), the pins are fixed, the adjustment being applied directly to the spring in order to increase or decrease the thrust applied to the friction member.

In a fifth modiiication (Figures 18 to 23), the adjustable carrier is provided with diagonal slots for the pin on thefriction-applying unit.

Sash-holding device with adju-stable guide pins Referring to the drawings in detail, Figures l to 7 inclusive show the preferred form of the invention as applied to a lower window sash I and an upper window sash II movable up and down within a window frame I2 (Figure 7). Each window sash (I Il or II) has horizontal members I3 and vertical members I4 (Figure 7) forming a frame for the window pane I5 ih the usual way. The vertical sash member I4 is provided with an elongated vertical groove I3 in which'is mounted the sash-holding device generally designated I1. The window frame I 2 is provided with the usual groove I8 having side walls I9 and front and rear walls 20 and 2I respectively. A metal weatherstrip member 22 is inserted in the groove I8 and is bent to provide a tongue or rib 23 entering the groove I6. The weatherstrip 22 is likewise provided with a bent portion 24 arranged between the outer face 25 of the vertical sash member I 4- and the front wall 20 of the window frame groove I8.

The sash-holding device I1 consists of a container generally designated 26 (Figure 6), preferably of bent sheet metal and serving to receive the friction-applying unit generally designated 21 (Figure 5). The container 26 consists of elongated side walls 28 and 29 bent at right angles to each other. nates at its upper end in a tab 3l) perpendicular thereto, and also at its upper and lower ends carries corner portions 3| and 32 consisting of tabs 33, 34, and 33 bent respectively to form such corners (Figure 6). The side wall 29 is provided at its upper and lower ends with tabs 31 and 38adjacent and aligned with the tabs 34 and 36 on the corner portions 3l and 32.

The side Wall 28 termi-r The friction-applying unit 21 which is inserted in the space defined by the side walls 28 and 29 and the tabs 33 to 38 inclusive consists of an elongated channel member 40 having a central portion 4I and parallel side portions 42. Secured as at 43 to the central portion 4I of the channel member 40 is a friction member 44 of any suitable friction-applying material, such as -fiber or the like. The side portions 42 of the channel member 43 are provided with oblique upper and lower pairs of slots 45 and 46 disposed at anv ang-le to the central portion 4I. Received within and engaging these oblique or diagonal slots 45 and 46 are pins 41 and 48 mounted in the arms 49 and 50 respectively of a U-shaped elongated carrier generally designated 5I and having an elongated portion 52 joining the two arms 49 and 55. The upper arm 49 is provided with a threaded lonigtudinal hole 53 which receives the threaded portion 5'4 of a screw 55 (Figures l and 3). The upper end of the screw 55 is provided with an annular groove 56 engageable with the opposite tabs 34 and 31 and entering the space between them so as to anchor the screw 55 in a fixed position lonigtudinally While permitting its rotation.` Near its lower end, the channel member 40 is notched as at 51 to provide an anchorage for a partition member 58 (Figures 3 and 5), the latter being secured as at 59a to the central portion 4I of the channel member 40. Engaging the partition member 58 in the upper end of a coil spring 59, the lower end of which engages the tabs 36 and 38 as an abutment. The coil spring 59 thus urges the channel member 40 and the friction member 44 in a diagonally upward direction, guided by the adjustable guide pins 41 and 48.

The sash-holding device I'I is assembled by placing the coil spring 59 in position beneath the partition 58 and at the same time sliding the frictioneapplying unit 21 into the container 2E (Figures 5 and 6) with the annular groove 55 of the screw 55 entering the space between the tabs 34 and 31. The sash-holding device I1 may then be installed in the groove or recess I6 in the vertical sash members I4 in any suitable Way. This may be done by inserting screws 60 and 6I through the screw holes 62 and 63 in the upper and lower ends of the container 26 (Figure y6) thereby firmly securing the device to the window sash. The position of the friction member 44 may then be accurately adjusted by rotating the screw 55 by means of a screw driver, thereby causing the guide pins 41 and 48 to move up or down in the slots 45 and 46.

In the operation of the sash-holding device of Figures 1 to 7 inclusive, the screw 55 is adjusted in the above-described manner until the friction `member 44 engages the weatherstrip portion 23 with sufficient force to hold the window in an open position, yet permit it to be closed by the application of a sufficient force to the top meme ber I3 of the Window sash. As the window is raised to open it, the channel member 40 and friction member 44 attached thereto yields slight'T 1y, compressing the spring 59 but permitting the parts to slide relatively to each other. When the window is closed, however, the guide pins 41 and 48 engage the diagonal grooves 45 and 46 and tend to push the friction member 44 against the weatherstrip portion 23 with a firm and increased grip, thereby applying `more friction and requiring a greater force to close the window than to open it. This action not only serves to counteract the weight of the window when it is open,

but also assists the operator in opening and closing the window. In closing the window, the operator can use his own weight to assist him, hence a relatively great resistance can be set up to prevent accidental closing of the window. In opening the window, however, the operator has only the unassisted power of his arms, hence the resistance to be overcome in lifting the window ie decreased by the invention so that it is but slightly more than the weight of the window sash and its associated parts.

Modifications of container and gu'ide pin carrier The modication shown in Figure 8 employs the same friction-applying unit 21 as in Figures 1 to '1 inclusive so that the friction member 44 directly 'engages the frontwall 29 of the groove I8 in the window frame I2 rather than the weatherstrip portion 23. This is accomplished by forming the recess ISa for the device as a notch extending entirely out to the edge of the' sash rather than as a mere groove I6 with side walls (Figure 2). Thus the installation of Figure 8 may be made in windows which are not equipped with weatherstrips.

The modification shown in Figure 9 is similar to that shown in Figure 8 except that the friction member 44 enga-ges the side wall I9 of the groove IB inthe window frame I2 rather than the front wall 20. In order to accomplish this, the tab 39a of the container 26 in Figure 9 is shortened so as to ft the portion 64 of the sash member I4 instead of the main portion of the latter as in Figure 2. In other words, the tab 30a is swung around 90 degrees from the position of the tab 3U in Figure 2'.

The modification shown in Figure 10 employs a bent metal carrier 65 having loops 66 and 81 for holdingr the guide pins 41 and 48 instead of the solid block construction of the guide pin carrier 5I of Figures l to 6 inclusive. The sheet metal carrier 65 is provided with aligned holes 68 and 69 through the opposite sides of the loop 66, these holes being threaded to receive the threaded portion 54 of the adjusting screw 55. The remainer of the construction and the operation vof the modification shown in Figure is substantially the same as in the principal form of the invention.

Modification with adyustable spring pressure The modification shown in Figures 11 to 1-7 inclusive consists of a container generally desigone another in spaced relationship. The guide pins 18 and 19 are inserted and secured in holes 80 and 8l respectively in the opposite side walls 12 and 13. The lower tabs 16 and 11 are preferably bent into the positions shown (Figure 17) but the upper tabs 14 and 15 are left in the dotted positions (Figure 17) until the device is assembled. The side wall 13 is provided with a screw hole 82 at its lower end and a tab83 with a screw hole 84 at its upper end for securing the device to the sash.

beneath the partition member |90.

-" member 1 I.

The central portion 1I of'the .container 10 is provided with a tab at its upper end, this tab carrying a slot 86 which receives an annular groove 81 in the head of a rod 88. The lower end of the rod 88 is threaded as at 89 (Figure 17) and is there provided with a rectangular nut 90, above which is a coil spring 9|. The nut 99 thus acts as a movable and adjustable abutment for the coil spring 9|.

The friction-applying member 1I consists of a channel member 92 with a central portion 93 having a friction portion 94 of ber or other suitable material secured thereto as at '95. The opposite sidewalls 96 of the channel member 92 are provided with upper and lower elbbowshaped slots 91 and 98 respectively adapted to engage the xed guide pins 18 and 19. The channel member 92 is also provided with slots 99 for the securing of a partition member I 00 serving as an abutment for the upper end of the coil spring 9|. The partition member |00 is provided with a notch IUI (Figure 16) extending inward from the rear edge thereof.

In assembling the modication of Figures l1 to 17 inclusive, the lower end of the channel member I1 is inserted above the tabs 16 and 11 in the container 10 (Figures 16 and 17) with the elbow slots 91 and 98 embracing the guide pins 18` and 19 and with the coil spring 9| inserted The upper end of the channel member 92 is then pushed into position within the container 10, whereupon the tabs 14 and 15 are bent from their dotted positions to their full-line positions (Figure 17).

The sash-holding device thus assembled is inserted in the groove or recess I1 in the manner described in connection with the principal form of the invention (Figures l to 7 inclusive).

In the operation of the modification of Figures l1 to '17 inclusive, the screw 88 is rotated by an ordinary screw driver in order to raise or lower the nut and thus increase or decrease the pressure of the coil spring 9| exerted against the partition |00 within the friction-applying This accordingly regulates the force with which the friction member 94 engages the weatherstrip portion 23 or the side of the windowr frame groove I8, as the case may be. As the window is raised, the vfriction-applied portion 'II yields downwardly in its diagonal -grooves 91 and 98, thus decreasing the friction resistance and enabling the window to be easily raised. When the window is lowered, however, the force applied to the window and the weight of the window itself ,are exerted through the xed guide pins 18 and 19 and the slots 91 and 98 upon the friction member 94 and thereby urge it against the weatherstrip or window frame groove, as the case may be. This increased force requires a greater effort to be exerted in closing the window than in opening it, as described in connection with Figures 1 to 7 inclusive.

' Modification with adjustable slotted guide member frame II3 and the adjacent wall II1 of the sash |I|. The lip H5 is formed by vbending aI portion of the weatherstrip |I4 back on itself so as to provide a double thickness engaging the side wall of the groove ||0.

Secured within the sash groove ||0 and backing up .against the side wall I |8 is the sash-holding device, generally designated ||9, and consisting of the friction-applying unit generally designated (Figure 21), the adjustment unit generally designated |2I (Figure 22), and the casing generally designated |22 (Figure 23).

The friction-applying unit |20 'consists of a member |23 of channel-shaped cross section having a front wall |24 and side walls |25 bent at right angles thereto. Struck out from the slot |25 in the front wall |24 is an inwardly projecting tab |21 which serves as an abutment for a coil spring |28 by which 'the friction-applying unit |20 is urged into frictional engagement with the weatherstrip portion H5 (Figure 20). This frictional engagement is applied against a friction member |29 of any suitable friction-applying material such as fiber or the like, this being secured as at |30 to the front wall |24.

In order that the longitudinal urge of the coil spring |28 may be converted into a transverse motion of the member ,|23, the latter is provided with a pin |3| extending through holes |32 in the opposite side walls |25 (Figure 24) and having its end projecting slightly beyond the side walls |25. The pin I3| passes through and is slidable in inclined grooves |33 formed in the opposite side walls of a frame |34 forming the lower portion of the adjusting unit |2| (Figure 22). The frame |34 is formed of a pair of oppositely bent strips of material joined together as at |35 at their lower end and also coming together within the end slot |36 of the yoke portion |31 on the lower end of the adjusting screw |38, to which it is pivoted by the pivot pin |39 (Figure 22). The adjusting screw |38 is threaded into a hollow threaded sleeve |40 having an annular groove |4| adjacent its head |42, the latter being provided with a slot |43 for receiving the end of a screw driver.

The casing |22 is provided .with a T-shaped spring abutment member |44 (Figure 23) having its outer ends |45 slidable in longitudinal grooves |46 and having a central stern |41 extending into the center of the coil spring |28. The casing |22 is also of channel-shaped construction having a. rear wall |48 and side walls |49 perpendicular thereto. The side walls |49 are drilled as at |50 and |5| to receive a screw |52 (Figure 18) which passes through a hole |53 in a block |54 having arms |55 extending inwardly into the casing |22 and closely engaging the annular groove |4| in the threaded sleeve |40. The side walls |43 are also provided with apertures |50 (Figure 23) which provide free play for the projecting outer ends of the pin I3 I. The lower end of the casing |22 is provided with aligned holes |51 and |58 for the passage of a screw |59 (Figure 19) :and the lower ends |60 of the side walls |49 are bent towardone another like tabs so as to provide a bottom wall for the casing |22. (Figure 23).

In the operation of the modification of Figures 18 to 23, the sash-holding device IIS is inserted in the sash groove |40 and -secured rmly therein by the screws |52 and |50 passing into the sash I I I. The force of the coil spring |28 against the tab |21 urges the friction-applying unit |20 downward, sinie the T-shaped abutment |44 is incapable of moving upward beyond the upper ends of the slots |45. The downward motionof the friction-applying unit |20 is converted into transverse motion by the inclined slots |33 in the adjusting unit .|2|, so that as a result of this arrangement, the friction member |29 is forced against the inwardly projecting lip ||1 of the weather strip ||4. By applying a screw driver to the slot |43 and rotating the threaded sleeve |40, the frame |34 may be moved op or down, varying the adjustment of the friction-applying unit |20 relatively to the weather strip portion In this manner the sash-holding devices IIS applies a frictional force against the weatherstrip lip portion ||1 in such a manner that the force is reduced when the window is raised, but is increased when the window is lowered. By -this means, the person lopening the window is not required to exert as much force as in closing it, and the window will be held rmly open by the friction -exerted by the device. rIhus this modication, like the other forms of the invention, eliminates the need for sash weights and causes the window sash to be held rmly in any desired position.

While a specic embodiment of the invention has been described and illustrated, it will be understood that various modications may be made within the scope of the appended claims without departing from the spirit of the invention.

What I claim is:

l. A sash-holding device comprising a base member removablyl secured -to a window sash, a friction-applying member movably mounted on said base member, means for yieldably urging said friction-applying member outwardly with respect to said base member, and independent means swiveled in the upper end of said base member for adjustably limiting the motion of said friction applying member said independent means being removably mounted and suspended between a pair of spaced lugs carried by the base member to permit the easy removal and quick assembly of the base and friction applying member.

2. A sash-holding device comprising a base member removably secured to a window sash. a friction-applying member movably mounted on said base member, a friction member secured to said friction-applying member and engageable with a portion of the window frame, means for yieldingly urging 'said friction-applying member transversely relatively to said base member, and

independent means swiveled in the upper end of said base member for adjustably limiting the motion of said friction-applying member said independent means being removably mounted and suspended between a pair of spaced lugs carried by the base member to permit the easy removal and quick assembly of the base and friction applying member.

3. A sash-holding -device comprising a base member removably secured to a window sash, a friction-applying member movably mounted on said base member, a friction member secured to said friction-applying member and. engageable with a portion of the window frame, means for yieldingly urging said friction-applying member transversely relatively to said base member, independent means swiveled in the upper end of said base member for adjustably limiting the motion of said friction-applying member, said independent means being removably mounted and suspended between a pair of spaced lugs carried by the base member to permit the easy removal and quick assembly of the base and friction applying member and means for guiding the motion of said friction-applying member.

4. A sash-holding device comprising a base member removably secured to a Window sash, a friction-applying member movably mounted on said base member, a friction member secured to said friction-applyingmember and engageable with a portion of the window frame, means for yieldingly urging said friction-applying member transversely relatively to said base member,

means independent of the first mentioned means for adjustably limiting the motion of said friction-applying member, said last mentioned means being swiveled and removably mounted between a pair of spaced lugs carried by the upper end of said base member to facilitate removal and assembly of the friction applying member, and means for guiding the motion of said frictionapplying member in an oblique direction relatively to said base member. l

5. A sash-holding device comprising a base member removably secured to a window sash,v a friction-applying member movably mounted on said base member, a friction member secured to said friction-applying memberv and engageable with a portion of the-window frame, means foryieldingly urging said friction-applying member` transversely relatively to said base member, and

means independent of the first mentioned means for adjustably limiting the motion of said friotion-appiying member, said last mentioned meansl being swiveled and removably mounted between a. pair of spaced lugs carried by the upper end of said base member tofacilitate removal and assembly of the friction applying member, said friction-applying member having guide portions disposed'obliquely to said base member.

6. A sash-holding device for windows comprising a base member removably attached to a window sash, a channel member movable relatively to said base member and having obliquely disposed guide portions thereon, a friction mem ber on said channel member for frictionally engaging a friction surface within the groove of the window frame, projections engageable with said guide portions, a support for said projections, and means independent of said guide portions removably suspended from the upper portion of the casing and swiveled thereto between a pair of lugs on the base member for adjustably moving said support relatively to said base.

7. A sash-holding device for windows comprising a base member, a chanel member movable relatively to said base member and having obliquely disposed guide portions thereon, a friction member on said channel member for fric-l tionally engaging an element in the groove of the Window frame, projections engageable with said guide portions, a support for said pro-jections, and an adjusting screw suspended from a swivel support at the upper end said base and threadedly engaging said support for adjustably moving said support relatively to said base.

8. A sash-holding device for Windows comprising a base member, a channel member movable relatively to said base member [and having obliquely disposed guideways therein, a friction member on said channel member for frictionally engaging a weather-strip element in the groove of the window frame, guide pins engaging said guideways, a movable support for said guide pins, and means for adjustably moving said support relatively to said base, said means being removably suspended and swiveled between a pair of spaced ears on the upper end Vof the base to permit easy assembly of the channel member within the frame.

9. A sash-holding device for windows comprising a base member, a channel member movable relatively to said base member and having obliquely disposed guideways therein, a friction member on said channel member for frictionally engaging a portion of a groove in the frame of the window, guide pins engaging said guideways, a movable support for said guide pins, means removably suspended and swiveled between a pair of lugs at the upper end of the base for adjustably moving said support relatively to said base, and means for yieldingly urging said channel member away from said base.

10. A sash-holding device for windows comprising a base member, a channel member movable relatively to said base member and having obliquely disposed slots in the opposite side walls thereof, a friction member on said channel member for frictionally engaging Within a groove in the frame of the window, guide pins engaging said slots, a movable support for said guide pins, and means removably suspended and swiveled between a pair of lugs at the upper end of the base for adjustably moving said supportJ relatively to said base.

1l. A sash-holding device for windows comprising la, base member, a channel member movable relatively to said base member and having obliquely disposed guideways therein, a friction member on said channel member for frictionally engaging a portion of a groove in the frame of the Window, guide pins engaging said guideways, a movable support for said guide pins, means for yieldingly urging said channel member away from said base, and an adjusting screw suspended from a swivel support at the upper end of said base and threadedly engaging said support for moving said support relatively to said base.

12. A sash-holding device for windows compulsing a base member, a channel member movable relatively to said base member and having obliquely disposed guideways therein, a friction member on said channel member for frictionally engaging a portion in the guide groove of the window frame, guide pins engaging said guideways, a movable support for said guide pins, and means removably suspended and swiveled between a pair of ears at the upper end of the base for adjustably moving said support relatively yto said base, said support comprising a bar having said guide pins mounted near the opposite ends thereof.

13. A sash-holding device for windows comprising a base member, a channel membermovable relatively to said base member and having obliquely disposed guideways therein, a friction member on said channel member for frictionally engaging a portion within the guide groove of the window frame, guide pins engaging said guideways, a movable support for said guide pinsand means removably suspended and swiveled between a pair of spaced lugs on the upper end of the base for adjustably moving said support relatively to said base, said support comprising a member having loops near its opposite ends forreceiving said guide pins.

ROBERT H. BREITENBACH. LEON E. WILLETT. 

